Fill
a jar with jellybeans.Ask
the students to write on a slip of paper their estimates of how many
jellybeans are in the jar.They
must sign the slips and deposit them in a folder.

Challenge
kids to think of an easy way
to discover
the answer by thinking in terms of weight.Use
a scale that indicates either grams or ounces.Have
different children do the computations and record their findings on the
chalkboard.

Follow
these steps:

-Pour
the beans on the scale and weigh
them.-Weigh
a small paper cup. Fill it with beans and weigh it again.-Subtract
the weight of the cup to find the weight of the beans.-Count
the beans in this small sample.-Divide
the weight of all the beans by the weight of the sample.-Multiply
that answer by the number of beans in the sample to find the number of
beans in the jar.